Butch Malahide <fred.gal...@gmail.com> wrote:>> JohnF <john@please.see.sig.for.email.com> wrote:>>> Are there any functions f:N^3-->N (domain integers) that can't>>> be decomposed into some g,h:N^2-->N, where f(i,j,k)=g(i,h(j,k))?<big snip>>> See also Hilbert's 13th problem:> https://en.wikipedia.org/wiki/Hilbert%27s_thirteenth_problem

Thanks a lot, Fred. That certainly answers the question.Kind of surprising, to me, anyway, that it makes Hilbert's list.I'd tried googling before posting, but failed to constructa query that coughed up any relevant hits. Still takes humansto successfully do semantic searches. Thanks again,-- John Forkosh ( mailto: j@f.com where j=john and f=forkosh )